Improvement in sewing-machines



UNITED S'iAfrns FICE.

IMPROVEMENT IN SEWING-MACHINES.

Speciiication forming part of Letters Patent No. 117,002, dated July11,1871.

To all whom t may concern:

Be it known that I, JOHN P. SHERWOOD, of Fort Edward, in the county ofVashington and State of New York, have invented a new and usefulImprovement in Sewing-lvlachines; and I do hereby declare the followingto be a full, clear, and exact description of the same, reference beinghad to the accompanying drawing making a part of this specification, inwhich- Figure l is a side elevation. Fig. 2 is a plan view of the underside of the bed-plate, with the machinery in and below the same. Fig. 3is an elevation of the back side of the vertical plate that is placed atthe end of the horizontal arm which incloses the driving-shaft, with theinachinery thereto attached. Fig. 4 is made up of two elevations, oneofthe side and the other of the rim of the eccentric that is xed on theend of the driving-shaft. Fig. 5 is an elevation of the opposite side ofthe same eccentric from that shown in Fig. 4. Fig. 6 is made up of aplan view of the under side and a side elevation of theshuttle. Fig. 7is a partial side elevation of the said vertical plate with thethread-holder. Fig. 8 is a transverse section of the oscillating armwith the double-beveled slot; and Fig. 9 is a plan view of the shuttle,shuttle-race, and spring lv This invention consists in an oscillatingvertical arm that gives motion, beneath the bedplate, to theconnecting-rod which operates the shuttle-carrier, such arm beingprovided with a slot, each of whose sides is double beveled from avertical central line outward, in combination with a friction-roller onthe wrist-pin that projects from the side of the balance-wheel andtraverses such slot, the said roller also being double beveled from acentral circumferential line toward each end for the purpose of reducingfriction and giving room in which the wrist-pin may rise and fall in theslot as the arm oscilla-tes; also, in the combination of the saidoscillating arm passing vertically through the bed-plate with the saidconnecting-rod and shuttle-carrier; also, in a shuttle constructed witha spring-plate that forms part of one side, and is bent inward so as notto be ilush with the outer surface of the side of the shuttle, andbears, for tension purposes, on the shuttle-spool.

In Figs. l and 8, w is a bent arm that projects outward and upward froma vertical Jaaft, a', that is inclosed within the hollow standard y,Fig. 1, and is stepped in the box z, which projects downward from thelower side of the bedplate A. In the upper part of the arm w is a slot,B, which a wrist-pin projecting from the hub of the balance-wheel Dtraverses. The sides of the slot B are each beveled outward from avertical central line, as shown in Fig. S, in order to give room fortlle wrist-pin to work in as the arm fw oscillates under the action ofthe wristpin during the revolution of the balance-wheel. Thefriction-roller O that incloses the wrist-pin likewise tapers towardeach end from a central circumferential cylindrical surface. The effectof this construction is that the only points of contact between thesides of the slot and the surface of the friction-roller lie in thecylindrical central part of the latter and the central ridges of theformer, and friction is thereby reduced to its minimum. Instead of thetapering roller a ball may be used on the wrist-pin and the latter beelongated so as to permit the ball to travel ina circular pathwayin theslot 5 or, if the ballbe used,

the sides of the slot may beinade plane or convex.

To the vertical shaft a', below the bed-plate A, is attached, by castingwith it or otherwise, the swaybar E, Fig. 2, that vibrates as the shafta' oscillates on its vertical axis. To the outer extremity ofthesway-bar E the shuttle-carrier F is secured. The shuttle-carrier slideson a curved race-face, G. The lower sketch in Fig. 6 shows the sideofthe shuttle that slides next the raceface. This slide is made up inpart of a springtongue, H, disconnected from the shuttle at all pointsexcept at one end. The outer side of the spring-tongue is not liush withthe outer surface of the shuttle side, but is within the plane of saidsurface, forming, as it were, the bottom of a groove let into theshuttle side.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The bent arm w, provided with the doublebeveled slot B, incombina-tion with the doubletapered friction-roller O, or itsequivalent, as explained.

2. The combination of the bent arm w, vertical shaft x, sway-bar E, andshuttle-carrier F, all constructed as described.

3. The shuttle K, provided with the springtongue H, when the samesupports one end of the spool I and is sunk within the plane of theouter surface of the shuttle side, as set forth.

JOHN P. SHERWOOD.

Witnesses:

SoLoN KEMoN, THos. D. D. OURAND.

